Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST) , 1-1-1 Higashi , Tsukuba 305-8565 , Japan.
National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA) , 111 Thailand Science Park, Phahonyothin Road , Khlong Nueng, Khlong Luang , Pathum Thani 12120 , Thailand.
Anal Chem. 2018 Apr 3;90(7):4856-4862. doi: 10.1021/acs.analchem.8b00359. Epub 2018 Mar 23.
Ammonia gas is useful but caustic; thus, its concentration is monitored depending on applications. We prepared indium hexacyanoferrate nanoparticles (InHCF-NPs, HCF = [Fe(CN)]) with average diameter around 8 nm by simple reaction at room temperature between In cations and HCF anions, and we found the unique functionality of InHCF-NPs which were capable of highly sensitive (16 ppb) and exceptionally wide range (190000, 16 ppb -0.3%) detection of ammonia gas within 6 min by IR measurements. Slope changes of the IR peak ratio of adsorbed ammonium over CN moieties in the InHCF framework indicated a good log-log linear correlation along gas concentrations, in which a wide dynamic range over 10 was realized for the first time in the field of ammonia gas detection.
氨气具有一定的用途，但也具有腐蚀性；因此，其浓度会根据应用情况进行监测。我们通过铟阳离子和六氰合铁阴离子在室温下的简单反应，制备了平均直径约为 8nm 的六氰合铁酸铟纳米粒子（InHCF-NPs，HCF=[Fe(CN)6]4-），并发现了 InHCF-NPs 的独特功能，其能够在 6 分钟内通过红外测量对氨气进行高灵敏度（16ppb）和极宽范围（190000，16ppb-0.3%）的检测。InHCF 骨架中吸附的铵与 CN 基团的红外峰比值的斜率变化表明，在气体浓度范围内呈良好的对数线性相关，这在氨气检测领域中首次实现了超过 10 的宽动态范围。
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